Piston



Sept. 22, 1942. w. F. MORGAN PISTON Filed April 9, 1942 a M 4 mm a l 0 a #0 w Affok/vt Y v Patented Septrrs'roN William F. Morgan, Chicago, Ill. 1 Application April 9, 1942, Serial No. 438,251

Claims.

This invention relates to new and useful improvements in pistons, and more particularly to pistons used in connection with internal combustion engines.

Thus, it is one 01' the objects of this invention to provide pistonsthat are simple in construction, and, therefore, easy and cheap to manufacture.

It is another object of my invention to pro- .vide a piston comprising two parts, namely, a

head portion and skirt portion.

It is a further object of this invention to provide a piston in two parts with'the least amount of contact between the latter, thereby reducing to a minimum the transferring of heat from the head portion to the skirt portion.

It is a still further object of my invention to provide a piston, wherein the two parts, as mentioned, are held together by a wrist pin.

It is an additional object of this invention to provide a plurality of pins to keep the said two piston portions in alignment.

It has also been an object of my invention to provide a design for a piston head, whereby it is possible to construct both parts of the latter of substantially uniform thickness, that is, with all the walls, both of the head and skirt, of practically the same thickness, thereby avoiding the stresses set up in the metal by an uneven heating and expansion;

With the above and other objects in view, this invention consists of the novel features of pconstruction, combination and arrangement of ,parts, hereinafter fully described, claimed and ,illustrated in the accompanying drawing. forming part of this specification, and in which similar characters oi reference indicate corresponding parts in all views, and in which:

Figure 1 is a vertical section on the line ll of Figure 4.

Figure 2 is a vertical section through a piston ring recess, taken along theline 2-2 of Figure 1.

Figure 3 is a view taken at 90 degrees of Figure 1, half thereof being in section; while Figure 4 is a bottom plan view of Figure 1.

Referring more particularly to the drawing, l0 designates the piston in general, which consists of the head portion H, the skirt portion l2, the wrist pin l3, and the aligning pins H.

The head portion II is provided with two luglike extensions l5, which project into the pockets I. of the skirt portion l2; the said lug-like extensions ii are preferably reenforced by ribs l1. The head portion II has a plurality of conventional piston grooves It,

The pockets l6 or the skirt portion 12 each consists of a recessed portion is formed by a circular bottom wall 20 and two substantially vertical walls 2| and 22. These walls 20, 2| and 22 form in general appearance a round bottomed U-shaped pocket. The circumference of the skirt portion I2 is also provided with the conventional oil holes 23.

As shown in the drawing, there are spaces S, between the head portion II and the skirt portion l2, thus reducing to a minimum the contact of the two parts II and I2; and, thus, of course, reducing, also, to a minimum the transfer oi the excess amount of heat received by the head portion H in the normal course of operation of the internal combustion engine.

The alignment pins ll consist of an enlarged 7 portion 25 fitting closely into a recess 26 within the bottom portion of the lug-like extensions IS.

The bottom portion of the alignment pins I4 is reduced in diameter, as at 21 and fits into an elongated slot 28 in the bottom wall 20. The purpose of this pin is, as previously described. to assist in the alignment of the two major parts. The lug-like extensions I 5 are provided with openings 29, while the pockets I 6 are provided with openings 80, both openings 29 and 30 providing for a seat of the conventional wrist pin l3.

As illustrated in the drawing, it is considered preferably to provide for the oil holes 23 to termihate, as at 32, in a recessed portion of the outside wall of the skirt portion I2, thereby facilitating the free flow of lubricating oil. It is obvious that changes may be made in the form, construction and'arrangement oi the several parts, as shown, within the scope of the appended claims. without departing from the spirit of the invention, and'I do not, therefore, wish to limit myself to the exact construction and arrangement shown and described herein.

What I claim as new, Letters Patent of the United States, is:

I claim: l. A piston comprising a head portion and a skirt portion, the head portion being formed with lug-like extensions, the skirt portion having pockets adapted to receive the latter, and alignment pins arranged in said lug-like extensions and pockets, substantially asand for the purpose set forth.

2. A piston comprising a head portion and a skirt portion, the head portion being formed with lug-like extensions, re-inforcing ribs integral with the latter, the skirt portion having pockets adapted to seat said lug-like extensions, means and desire to secure by secnring the head portion andthe skirt portion together, alignment pins having an enlarged 1 top portion anda reduced bottom portion, the

i lug-like extensions and the pockets being formed with holes therein of a width to correspond with the width, respectively, of the alignment pins, and adapted to receive the latter.

3. ma device of the class described, a piston comprising a head portion and a skirt portion, I

wherein each of said pockets consists of a recessed portion formed by a circular bottom wall and two substantially verticalwalls. v

5. A piston comprising a head portion and a skirt portiomsaid head portion having two luglike extensions, the skirt portion being formed with twofsubstantially round bottomed U-shaped pockets therein adapted to receive the latter, said head portion and skirt portion being formed with openings therein, a wrist pin mounted in said openings; and means for aligning the head por- 4. In a device, its claimed in claim tion "and. skirt portion, substantially as shown and described. l

' WILLIAM F. MORGAN. 

